Lab 3. EIGRP - Filtering - Prefix List - In

 Lab 3. EIGRP - Filtering - Prefix List - In

Filtering menggunakan prefix list berfungsi untuk melakukan filter berdasarkan netmask nya. Misalnya kita akan melakukan filter pada network R3 dengan prefix /24 sampai /28 akan di block, maka selain itu akan ditampilkan pada routing table.

 

-R1

Router(config)#int e0/0

Router(config-if)#ip address 12.12.12.1 255.255.255.0

Router(config-if)#no shutdown

Router(config)#router eigrp 10

Router(config-router)# no auto-summary

Router(config-router)#network 12.12.12.0

 

-R2

Router(config)#int e0/0

Router(config-if)#ip address 12.12.12.2 255.255.255.0

Router(config-if)#no shutdown

Router(config)#int e0/1

Router(config-if)#ip address 23.23.23.1 255.255.255.0

Router(config-if)#no shutdown

Router(config)#router eigrp 10

Router(config-router)#

Router(config-router)#no auto-summary

Router(config-router)#network 12.12.12.0

Router(config-router)#network 23.23.23.0

-R3

Router(config)#int e0/0

Router(config-if)#ip address 23.23.23.2 255.255.255.0

Router(config-if)#no shutdown

 

Router(config)#int loopback 0

Router(config-if)#ip address 3.3.3.3 255.255.255.255

 

Router(config)#int loopback 1

Router(config-if)#ip address 3.3.3.17 255.255.255.240

 

Router(config)#int loopback 2

Router(config-if)#ip address 3.3.3.33 255.255.255.248

 

Router(config)#int loopback 3

Router(config-if)#ip address 3.3.3.100 255.255.255.224

 

Router(config)#int loopback 4

Router(config-if)#ip address 3.3.3.150 255.255.255.252

 

Router(config)#int loopback 5

Router(config-if)#ip address 3.3.3.200 255.255.255.240

 

Router(config)#router eigrp 10

Router(config-router)#no auto-summary

Router(config-router)#network 0.0.0.0

 

Selanjutnya kita akan mengecek table routing pada R1 dan R2:

 

 

-R1

Router(config)#do show ip route

3.0.0.0/8 is variably subnetted, 6 subnets, 5 masks

D        3.3.3.3/32 [90/435200] via 12.12.12.2, 00:00:22, Ethernet0/0

D        3.3.3.16/28 [90/435200] via 12.12.12.2, 00:00:22, Ethernet0/0

D        3.3.3.32/29 [90/435200] via 12.12.12.2, 00:00:22, Ethernet0/0

D        3.3.3.96/27 [90/435200] via 12.12.12.2, 00:00:22, Ethernet0/0

D        3.3.3.148/30 [90/435200] via 12.12.12.2, 00:00:22, Ethernet0/0

D        3.3.3.192/28 [90/435200] via 12.12.12.2, 00:00:22, Ethernet0/0

      12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C        12.12.12.0/24 is directly connected, Ethernet0/0

L        12.12.12.1/32 is directly connected, Ethernet0/0

 

-R2

Router(config-router)#do show ip route

3.0.0.0/8 is variably subnetted, 6 subnets, 5 masks

D        3.3.3.3/32 [90/409600] via 23.23.23.2, 00:08:02, Ethernet0/1

D        3.3.3.16/28 [90/409600] via 23.23.23.2, 00:08:02, Ethernet0/1

D        3.3.3.32/29 [90/409600] via 23.23.23.2, 00:08:02, Ethernet0/1

D        3.3.3.96/27 [90/409600] via 23.23.23.2, 00:08:02, Ethernet0/1

D        3.3.3.148/30 [90/409600] via 23.23.23.2, 00:08:02, Ethernet0/1

D        3.3.3.192/28 [90/409600] via 23.23.23.2, 00:08:02, Ethernet0/1

      12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C        12.12.12.0/24 is directly connected, Ethernet0/0

L        12.12.12.2/32 is directly connected, Ethernet0/0

 

 

 

 

Selanjutnya kita akan konfigurasikan prefix list filtering pada R2:

-R2

Router(config)#ip prefix-list EIGRP_IN seq 10 deny 3.3.3.0/24 le 28

Router(config)#ip prefix-list EIGRP_IN seq 20 permit 0.0.0.0/0 le 32

Router(config)#router eigrp 10

Router(config-router)#distribute-list prefix EIGRP_IN in

 

Setelah melakukan konfigurasikan kita akan mengecek table routing, pastikan network 3.3.3.X dengan prefix antara /24 sampai /28 sudah tidak ada. Dan hanya terdapat prefix antara /29 sampai /30.

-R2

Router(config-router)#do show ip route

3.0.0.0/8 is variably subnetted, 3 subnets, 3 masks

D        3.3.3.3/32 [90/409600] via 23.23.23.2, 00:08:09, Ethernet0/1

D        3.3.3.32/29 [90/409600] via 23.23.23.2, 00:08:09, Ethernet0/1

D        3.3.3.148/30 [90/409600] via 23.23.23.2, 00:08:09, Ethernet0/1

      12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C        12.12.12.0/24 is directly connected, Ethernet0/0

L        12.12.12.2/32 is directly connected, Ethernet0/0

      23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C        23.23.23.0/24 is directly connected, Ethernet0/1

L        23.23.23.1/32 is directly connected, Ethernet0/1

 

Maka sudah selesai!